Structural and transport properties of the incommensurate organic superconductor (MDT-ST) (I3) 0.417

Tadashi Kawamoto, Takehiko Mori, Shinya Uji, Jun Ichi Yamaura, Hiroshi Kitagawa, Ayumi Takamori, Kazuo Takimiya, Tetsuo Otsubo

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10 Citations (Scopus)


The incommensurate anion sublattice and transport properties of the organic superconductor (MDT- ST) I1+δ [MDT-ST: 5H -2-(1,3-dithiol-2-ylidene)-1,3- diselena-4,6-dithiapentalene] are investigated. The Raman spectra as well as the incommensurate spots observed in the x-ray-oscillation photograph provide clear evidence that the polyiodide chain is composed of I3- units. From these, the composition is determined to be (MDT-ST) (I3) 0.417, and the degree of charge transfer is 0.417. The thermoelectric power shows large negative phonon drag at low temperatures in spite of the clean metallic resistive behavior. That the fundamental Raman line of the I3- chains is split into two lines below 150 K without any extra satellite reflections in the x-ray photographs suggests the possibility of a small structural change in the anion lattice.

Original languageEnglish
Article number172503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 2005
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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